diff --git a/src/encryptid/server.ts b/src/encryptid/server.ts
index 9ca5b99..b288c0b 100644
--- a/src/encryptid/server.ts
+++ b/src/encryptid/server.ts
@@ -126,6 +126,9 @@ if (CONFIG.smtp.pass) {
       user: CONFIG.smtp.user,
       pass: CONFIG.smtp.pass,
     },
+    tls: {
+      rejectUnauthorized: false,  // Internal Mailcow uses self-signed cert
+    },
   });
 
   // Verify connection on startup